An object 2.5 cm high is placed at a distance of 10 cm from a concave mirror of radius of curvature 30 cm. The size of the image is
9.2 cm
10.5 cm
5.6 cm
7.5 cm
R=−30cm⇒f=−15cm O=+2.5cm,u=−10cm By mirror formula 1−15=1v+1(−10)⇒v=30cm. Also IO=−vu⇒I(+2.5)=−30(−10)⇒I=+7.5cm